CA1303475C - Chair base - Google Patents
Chair baseInfo
- Publication number
- CA1303475C CA1303475C CA000602319A CA602319A CA1303475C CA 1303475 C CA1303475 C CA 1303475C CA 000602319 A CA000602319 A CA 000602319A CA 602319 A CA602319 A CA 602319A CA 1303475 C CA1303475 C CA 1303475C
- Authority
- CA
- Canada
- Prior art keywords
- chair base
- mounting means
- straps
- legs
- base according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C7/00—Parts, details, or accessories of chairs or stools
- A47C7/002—Chair or stool bases
- A47C7/004—Chair or stool bases for chairs or stools with central column, e.g. office chairs
Abstract
CHAIR BASE
Abstract A chair base comprises a central hub (10) around which are arranged parallel pairs of quarter sine wave shaped steel straps (16) which radiate outwardly in an equally spaced apart configuration. A caster socket block (20) is interposed in the space between the two straps of each pair thereof at an outer end (18). The central hub (10) and the caster sockets (20) are covered by plastic shells (34), and the exposed steel straps (16) are coated.
Abstract A chair base comprises a central hub (10) around which are arranged parallel pairs of quarter sine wave shaped steel straps (16) which radiate outwardly in an equally spaced apart configuration. A caster socket block (20) is interposed in the space between the two straps of each pair thereof at an outer end (18). The central hub (10) and the caster sockets (20) are covered by plastic shells (34), and the exposed steel straps (16) are coated.
Description
L3~3~
.
CHA I R ~AS E
BACKGROUND OF THE INVENTION
._ . . _ . .
Field of the Invention ~l .: .
This invention relates to a metal chair base for office chairs and the like, and more particularly to a novel constructiOn of a chair base which is simplified, lightweight and highly durable.
State of the Prior Art .
Various chair bases of the kind having support legs radiating from a central column or pedestal have long been employed for the support of office chairs and other pieces of furniture suitable for office and home ~.
alike. Such bases are popular because of their aesthetic qualities and adaptability for use with various tilt and swivel mechanisms.
In the highly competitive furniture industry, it is desirable to provide chair bases that are highly durable/ yet light in weight and relatively inexpensive to produce. One common type of chair base assembly employs a plurality o tubular members arranged about a central hub Examples can be found in U.S. Patent No.
4g005~841 to Rensland et al, issued February 1l 1977 and U.S. Patent No. 2,470,397 to Harter, issued May 17, 1949. While such tubuIar chair bases may be light in ~
weight, they lack the necessary strength, particularly --in a direction lateral to the tubular member, which may ~5 be required in a modern office environment.
Other types of chair base assemblies common in the art include a plurality of tapered legs disposed radi-ally around a central hub and secured to the hub by welding. one example of such a chair base is disclosed in U.S. Patent No. 3,281,105 to Kafferlin, et al, issued October 25, 1966. The leg elements and the central column in such bases are necessarily made of relatively ~
heavy gauge material in order to sustain normal stresses ~:
and to prevent flexure and deformation of the legs, particularly in the area of the welded joints. Flanges are also frequently used to provide additional strength ~ -2- ~3~
to the legs to prevent deformation- Such bases are generally durable, but are nevertheless heavy, and require more material in their construction thus increasing their cost and weight. '~.7., Other welded joints have been proposed in U.S.
Patents 3,682,425 to Vincent et al, issued August 8, -1972 and 4,084,776 to Cook, issued April 18, 1978 which address the problem oE weaknesses introduced by welding. The proposed expedients, however, do not solve the problem of obtaining a highly durable chair base, using steel, for example, and simultaneously maintaining a relatively light weight and simple construction. ;
, ....
SUMMARY OF THE INVENTION ;_ According to the invention, a chair base of the type which has a central hub or column, a plurality of legs 15 extending radially from the central hub, and means for mounting casters at the outer ends of the legs, is provided in which each of the ].egs is formed from a pair of straps spaced apart in a parallel configuration open at the top and bottom thereof. Each of the straps preferably has a shape conforming generally to a first quadrant one-quarter sine wave with one end of the strap ~;
secured to an upper portion o the columnD The mounting of the straps at an upper portion of the hub provides greater stability and strength to the chair base than if the legs were mounted to a lower portion o~ the hub.
The hub and the straps may be formed oE ordinary carbon steel and welded together at the juncture there-of. ~he hub is preferably covered with a separate decorative plastic cover which is held in place by a C-clip. Further, the straps may be coated with a decorative coating, such as paint or a plastic material for protective purposes.
The caster mounting means preferably comprise a ;~
socket block, typically made of metal and welded between each pair of straps. Desirably, a separate decorative cover is securely mounted to each of the socket blocks ~ -3- f ~3~3~7~; ~
to provide a decorative and protective cover ~herefor.
The chair base is of the type wherein the central hub is hollow and preferably cylindrical in configu-ration. A height-adjusting cylinder is preferably mounted within the hub and provided with a decorative cover.
The invention provides a low-cost but very sturdy chair base, and one which is very attractive in appearance, The lew cost and strength are derived from the use of ordinary steel whieh is joined by conven-tional welding techniques. The strength is further ln provided by mounting the straps to the upper portion of the hub without the use of bent tubing and the like.
Rigid straps can be used for this purpose. The chair base is made decorative by the use of plastic coatings and coverings over the steel parts and weldments. The coatings and coverings are easily and inexpensively applied. Purther, the coatings and covers can be of any color which has the advantage of complementing any color in the chair. Thus, the chair bases can be of various different colors as desired to complement the color of the upholstery or shell of the chair.
~,,"
BRIEF DESCRIPTION O DRAWINGS
The invention will now be described with reference to the accompanying drawings in which: ~`
Figure 1 is a partially exploded isometric view of a chair base according to the invention;
Figure 2 is a top plan view of the chair base shown in Figure 1 with all but one of the decorative parts removed;
Figure 3 is an elevational view of the chair base of Figures 1 and 2 taken along line 3-3 of Figure 2 with all but one of the legs removed for clarity;
Figure ~ is a sectional view in elevation and-taken throuyh the central hub of the chair base of Figure 1 '~
illustrating the interconnection of the parts; and Figure 5 is a sectional view in elevation and taken ~ -4- ~
~L3~3~
along line 5-5 of ~igure 2.
., DETAILED DESCRIPTION OF THE PREFE~RED EMBODIMENT
Referring first to Figure 1I the chair base com-prises a steel hollow central hub 10 having an upper portion 12 and a lower end 14 around which are spaced a series of legs, each formed of a pair oE steel straps 16. The hub is preferably cylindrical in shape, but may be any shape which is aesthetically pleasing to complement the entire chair design. The straps 16 are roughly shaped in the form of a quarter sine wave and are arranged in parallel pairs with each strap welded to .
the upper portion 12 of the central hub 10 such that the '`
pairs extend radially outwardly in an equally spaced `.--apart configuration. The straps 16 of each pair are thùs not directly connected along their span, there being an open space between them. In the embodiment shown, they are arranged in five pairs to form five legs, but more or fewer pairs may be provided, depending upon the particular desired configuration of the chair base. As can be seen in Figure 3, the shape of the straps 16 is such that outer ends 18 of the straps 16 are lower than upper ends 19 thereof, and they extend ~`
downwardly below the plane of the lower end 14 of the central hub 10. Thus when weight is applied to the i~
central hub, the force will be transferred laterally outwardly and downwardly through each pair of straps 16. Existing chair bases with straight legs radiatin~
outwardly from a central hub tend to transfer the -downward force in a shear direction transversely through ~ :~
the leg. The quarter sine wave shape oÇ the straps 16 translates the downward force laterally across the span of the leg, thus permitting higher forces to be transmitted by a relatively thinner material. ~urther, ~
the paired configuration tends to resist flexure of the ~;
straps, thus permitting the use of relatively thin straps and consequently lessening the cost of materials. Also, the chair base occupies less floor 3~?~
space to sustain a ~iven load than existing chairs, and permits more space for freedom of foot movement underneath the chair.
As shown in ~igure 2, the outer end 18 of each pair of straps 16 mounts a caster socket block 20 interposed in the space between the two straps of each pair and S preferably welded. A socket 22 in each caster socket block receives the spindle of a conventional caster, not shown. A smaller bore 23 parallels the socket 22 in each caster socket block, and is spaced inwardly ~f hole 22 with respect to the hub 10. An end plate 24 with a central aperture 26 covers the lower end 14 of the ~, central hub 10. tSee Figure 3.) Referring again to Figure 1, the central hub 10 may be internally dimensioned to receive, for example, a conventional pneumatic air cylinder mechanism 28 for -15 height adjustment of a chair seat ~not shown). Such chair seat forms no part of this invention.
Alternatively, a conventional mechanical height adjustment mechanism (not shown) may be inserted into the central hub 10. The chair adjustment mechanism 28 further comprises a shaft 27 extending upwardly from the top thereof on which a chair seat may be mounted, and a ~--stubshaft 29 extending from the bottom. A cap 30, preferably made of plastic, and having a central aperture 32 covers the top of the hub 10 and the shaft '~~
27 of the chair adjustment mechanism 28 in order to protect the mechanism 28 and the hub 10 from abrasions and also to provide an aesthetic appearance. As shown in ~igure 4, the cap 30 comprises a plug portion 31 dimensioned to fit snugly into the hollow interior of central hub 10~ The central aperture 32 extendin~
through the cap 30 is thus elongated, such that when the cap 30 is mounted on the hub 10, the shaft 27 of the chair adjustment mechanism 28 extends through the aperture 32 and is stabilized and supported thereby.
The cap 30 also has an annular shoulder 33 which serves to limit movement o~ the cap 30 into the hub 10. An 3~
annular groove 40 on the shoulder 33 extends circumferentially around the cap, exterior to the hub 10, for a purpose to be described hereinafter.
A cylindrical shell 34, also preferably of plastic, is open at an upper end thereof, and has a bottom 35 :
closing a lower end thereof to form a cup. A series of elongate slots 36 extends downwardly from the open end, through a longitudinal distance approximately equal to the length of the junction between each straps 16 and the hub 10. The shell 34 covers the central hub 10 from the bottom such that the straps 16 are received in slots 36, allowing the cylindrical shell 34 to cover the -entire central hub 10 and to rest in juxtaposition to the cap 30. An upper rim 41 of the shell 34 is received in the groove 40 of the shoulder 33 to provide a secure -connection between the cap 30 and the shell 34. The bottom 35 of the shell 34 has a centrally located aperture 37 through which the stubshaft 29 of the chair adjustment mechanism 28 extends. A fastener 38 such as a conventional C-clip mounts an annular groove 39 on the stubshaft 29 to retain the shell 34 on the hub 10, and also-to secure the chair adjustment mechanism 28 in the hub 10. An annular rib 42 on the perimeter of the ~.
bottom 35 of the shell 34 extends ~ownwardly and serves to conceal the C-clip 38 and contribute to the aesthetic appearance of the chair base.
Caster socket covers 44, also preferably made of plastic, are dimensioned to cover the outer end 18 and caster socket 2~ of each pair of straps 16 to provide protection from abrasions and also to enhance the appearance of the chair base. As can be seen in Figure 5, a finger 46 extends downwardly from the inside top of the caster socket cover 44 into the smaller hole 23 of the caster socket 20. ~ screw 48 inserted through hole _ 23 from the bottom and into the finger 46 secures the ~
cnver 44 in place. Covers 44 may be of any shape :-consistent with the overall appearance of the chair s~
long as each adequately covers the socket block 20. For f~
~ 7 example, the exterior of the cover may continue the lines of the straps 16. All decorative and protective plastic parts 30, 34, 44 may be colored to provide a pleasing and attractive appearance which will complement any chair seat mounted to the base.
The steel straps 16 and the use of plastic covers 30, 34, 44 permit construction of the chair base at significantly less cost. The straps 16 may be stamped out and welded to the hub 10 without any secondary operations such as forming, coining, rounding, or similar finishing operations. The covers 30, 34, 44 conceal unsightly weldments. As seen in Figs. 3 and 5 the straps 16 may also be coated with a suitable protective coating 50 such as paint or vinyl. Preferably, the straps 16 are dipped in plastisol to obtain a significant thickness of coating, greater than would be provided by with paint. The coating may be colored to complement the overall color scheme of the chair.
It can readily be seen that the invention described herein provides a highly durable chair base which is relatively light in weight while~mdintaining a high degrse of stability and strength. The simple, conventional materials and simplified construction permit a substantial savings in material and labor costs~ and also allow flexibility in choosing aesthetically pleasing and novel designs.
Reasonable variation and modifications are possible within the scope of the foregoing disclosure and drawing without departing from the spirit of the invention which is defined by the appended claims.
.
CHA I R ~AS E
BACKGROUND OF THE INVENTION
._ . . _ . .
Field of the Invention ~l .: .
This invention relates to a metal chair base for office chairs and the like, and more particularly to a novel constructiOn of a chair base which is simplified, lightweight and highly durable.
State of the Prior Art .
Various chair bases of the kind having support legs radiating from a central column or pedestal have long been employed for the support of office chairs and other pieces of furniture suitable for office and home ~.
alike. Such bases are popular because of their aesthetic qualities and adaptability for use with various tilt and swivel mechanisms.
In the highly competitive furniture industry, it is desirable to provide chair bases that are highly durable/ yet light in weight and relatively inexpensive to produce. One common type of chair base assembly employs a plurality o tubular members arranged about a central hub Examples can be found in U.S. Patent No.
4g005~841 to Rensland et al, issued February 1l 1977 and U.S. Patent No. 2,470,397 to Harter, issued May 17, 1949. While such tubuIar chair bases may be light in ~
weight, they lack the necessary strength, particularly --in a direction lateral to the tubular member, which may ~5 be required in a modern office environment.
Other types of chair base assemblies common in the art include a plurality of tapered legs disposed radi-ally around a central hub and secured to the hub by welding. one example of such a chair base is disclosed in U.S. Patent No. 3,281,105 to Kafferlin, et al, issued October 25, 1966. The leg elements and the central column in such bases are necessarily made of relatively ~
heavy gauge material in order to sustain normal stresses ~:
and to prevent flexure and deformation of the legs, particularly in the area of the welded joints. Flanges are also frequently used to provide additional strength ~ -2- ~3~
to the legs to prevent deformation- Such bases are generally durable, but are nevertheless heavy, and require more material in their construction thus increasing their cost and weight. '~.7., Other welded joints have been proposed in U.S.
Patents 3,682,425 to Vincent et al, issued August 8, -1972 and 4,084,776 to Cook, issued April 18, 1978 which address the problem oE weaknesses introduced by welding. The proposed expedients, however, do not solve the problem of obtaining a highly durable chair base, using steel, for example, and simultaneously maintaining a relatively light weight and simple construction. ;
, ....
SUMMARY OF THE INVENTION ;_ According to the invention, a chair base of the type which has a central hub or column, a plurality of legs 15 extending radially from the central hub, and means for mounting casters at the outer ends of the legs, is provided in which each of the ].egs is formed from a pair of straps spaced apart in a parallel configuration open at the top and bottom thereof. Each of the straps preferably has a shape conforming generally to a first quadrant one-quarter sine wave with one end of the strap ~;
secured to an upper portion o the columnD The mounting of the straps at an upper portion of the hub provides greater stability and strength to the chair base than if the legs were mounted to a lower portion o~ the hub.
The hub and the straps may be formed oE ordinary carbon steel and welded together at the juncture there-of. ~he hub is preferably covered with a separate decorative plastic cover which is held in place by a C-clip. Further, the straps may be coated with a decorative coating, such as paint or a plastic material for protective purposes.
The caster mounting means preferably comprise a ;~
socket block, typically made of metal and welded between each pair of straps. Desirably, a separate decorative cover is securely mounted to each of the socket blocks ~ -3- f ~3~3~7~; ~
to provide a decorative and protective cover ~herefor.
The chair base is of the type wherein the central hub is hollow and preferably cylindrical in configu-ration. A height-adjusting cylinder is preferably mounted within the hub and provided with a decorative cover.
The invention provides a low-cost but very sturdy chair base, and one which is very attractive in appearance, The lew cost and strength are derived from the use of ordinary steel whieh is joined by conven-tional welding techniques. The strength is further ln provided by mounting the straps to the upper portion of the hub without the use of bent tubing and the like.
Rigid straps can be used for this purpose. The chair base is made decorative by the use of plastic coatings and coverings over the steel parts and weldments. The coatings and coverings are easily and inexpensively applied. Purther, the coatings and covers can be of any color which has the advantage of complementing any color in the chair. Thus, the chair bases can be of various different colors as desired to complement the color of the upholstery or shell of the chair.
~,,"
BRIEF DESCRIPTION O DRAWINGS
The invention will now be described with reference to the accompanying drawings in which: ~`
Figure 1 is a partially exploded isometric view of a chair base according to the invention;
Figure 2 is a top plan view of the chair base shown in Figure 1 with all but one of the decorative parts removed;
Figure 3 is an elevational view of the chair base of Figures 1 and 2 taken along line 3-3 of Figure 2 with all but one of the legs removed for clarity;
Figure ~ is a sectional view in elevation and-taken throuyh the central hub of the chair base of Figure 1 '~
illustrating the interconnection of the parts; and Figure 5 is a sectional view in elevation and taken ~ -4- ~
~L3~3~
along line 5-5 of ~igure 2.
., DETAILED DESCRIPTION OF THE PREFE~RED EMBODIMENT
Referring first to Figure 1I the chair base com-prises a steel hollow central hub 10 having an upper portion 12 and a lower end 14 around which are spaced a series of legs, each formed of a pair oE steel straps 16. The hub is preferably cylindrical in shape, but may be any shape which is aesthetically pleasing to complement the entire chair design. The straps 16 are roughly shaped in the form of a quarter sine wave and are arranged in parallel pairs with each strap welded to .
the upper portion 12 of the central hub 10 such that the '`
pairs extend radially outwardly in an equally spaced `.--apart configuration. The straps 16 of each pair are thùs not directly connected along their span, there being an open space between them. In the embodiment shown, they are arranged in five pairs to form five legs, but more or fewer pairs may be provided, depending upon the particular desired configuration of the chair base. As can be seen in Figure 3, the shape of the straps 16 is such that outer ends 18 of the straps 16 are lower than upper ends 19 thereof, and they extend ~`
downwardly below the plane of the lower end 14 of the central hub 10. Thus when weight is applied to the i~
central hub, the force will be transferred laterally outwardly and downwardly through each pair of straps 16. Existing chair bases with straight legs radiatin~
outwardly from a central hub tend to transfer the -downward force in a shear direction transversely through ~ :~
the leg. The quarter sine wave shape oÇ the straps 16 translates the downward force laterally across the span of the leg, thus permitting higher forces to be transmitted by a relatively thinner material. ~urther, ~
the paired configuration tends to resist flexure of the ~;
straps, thus permitting the use of relatively thin straps and consequently lessening the cost of materials. Also, the chair base occupies less floor 3~?~
space to sustain a ~iven load than existing chairs, and permits more space for freedom of foot movement underneath the chair.
As shown in ~igure 2, the outer end 18 of each pair of straps 16 mounts a caster socket block 20 interposed in the space between the two straps of each pair and S preferably welded. A socket 22 in each caster socket block receives the spindle of a conventional caster, not shown. A smaller bore 23 parallels the socket 22 in each caster socket block, and is spaced inwardly ~f hole 22 with respect to the hub 10. An end plate 24 with a central aperture 26 covers the lower end 14 of the ~, central hub 10. tSee Figure 3.) Referring again to Figure 1, the central hub 10 may be internally dimensioned to receive, for example, a conventional pneumatic air cylinder mechanism 28 for -15 height adjustment of a chair seat ~not shown). Such chair seat forms no part of this invention.
Alternatively, a conventional mechanical height adjustment mechanism (not shown) may be inserted into the central hub 10. The chair adjustment mechanism 28 further comprises a shaft 27 extending upwardly from the top thereof on which a chair seat may be mounted, and a ~--stubshaft 29 extending from the bottom. A cap 30, preferably made of plastic, and having a central aperture 32 covers the top of the hub 10 and the shaft '~~
27 of the chair adjustment mechanism 28 in order to protect the mechanism 28 and the hub 10 from abrasions and also to provide an aesthetic appearance. As shown in ~igure 4, the cap 30 comprises a plug portion 31 dimensioned to fit snugly into the hollow interior of central hub 10~ The central aperture 32 extendin~
through the cap 30 is thus elongated, such that when the cap 30 is mounted on the hub 10, the shaft 27 of the chair adjustment mechanism 28 extends through the aperture 32 and is stabilized and supported thereby.
The cap 30 also has an annular shoulder 33 which serves to limit movement o~ the cap 30 into the hub 10. An 3~
annular groove 40 on the shoulder 33 extends circumferentially around the cap, exterior to the hub 10, for a purpose to be described hereinafter.
A cylindrical shell 34, also preferably of plastic, is open at an upper end thereof, and has a bottom 35 :
closing a lower end thereof to form a cup. A series of elongate slots 36 extends downwardly from the open end, through a longitudinal distance approximately equal to the length of the junction between each straps 16 and the hub 10. The shell 34 covers the central hub 10 from the bottom such that the straps 16 are received in slots 36, allowing the cylindrical shell 34 to cover the -entire central hub 10 and to rest in juxtaposition to the cap 30. An upper rim 41 of the shell 34 is received in the groove 40 of the shoulder 33 to provide a secure -connection between the cap 30 and the shell 34. The bottom 35 of the shell 34 has a centrally located aperture 37 through which the stubshaft 29 of the chair adjustment mechanism 28 extends. A fastener 38 such as a conventional C-clip mounts an annular groove 39 on the stubshaft 29 to retain the shell 34 on the hub 10, and also-to secure the chair adjustment mechanism 28 in the hub 10. An annular rib 42 on the perimeter of the ~.
bottom 35 of the shell 34 extends ~ownwardly and serves to conceal the C-clip 38 and contribute to the aesthetic appearance of the chair base.
Caster socket covers 44, also preferably made of plastic, are dimensioned to cover the outer end 18 and caster socket 2~ of each pair of straps 16 to provide protection from abrasions and also to enhance the appearance of the chair base. As can be seen in Figure 5, a finger 46 extends downwardly from the inside top of the caster socket cover 44 into the smaller hole 23 of the caster socket 20. ~ screw 48 inserted through hole _ 23 from the bottom and into the finger 46 secures the ~
cnver 44 in place. Covers 44 may be of any shape :-consistent with the overall appearance of the chair s~
long as each adequately covers the socket block 20. For f~
~ 7 example, the exterior of the cover may continue the lines of the straps 16. All decorative and protective plastic parts 30, 34, 44 may be colored to provide a pleasing and attractive appearance which will complement any chair seat mounted to the base.
The steel straps 16 and the use of plastic covers 30, 34, 44 permit construction of the chair base at significantly less cost. The straps 16 may be stamped out and welded to the hub 10 without any secondary operations such as forming, coining, rounding, or similar finishing operations. The covers 30, 34, 44 conceal unsightly weldments. As seen in Figs. 3 and 5 the straps 16 may also be coated with a suitable protective coating 50 such as paint or vinyl. Preferably, the straps 16 are dipped in plastisol to obtain a significant thickness of coating, greater than would be provided by with paint. The coating may be colored to complement the overall color scheme of the chair.
It can readily be seen that the invention described herein provides a highly durable chair base which is relatively light in weight while~mdintaining a high degrse of stability and strength. The simple, conventional materials and simplified construction permit a substantial savings in material and labor costs~ and also allow flexibility in choosing aesthetically pleasing and novel designs.
Reasonable variation and modifications are possible within the scope of the foregoing disclosure and drawing without departing from the spirit of the invention which is defined by the appended claims.
Claims (15)
1. A method of making a chair base having seat mounting means and multiple legs secured thereto, said method comprising the steps of:
forming a plurality of straps from steel;
securing pairs of said straps to the seat mounting means in parallel relation to one another to form said legs; and coating at least a portion of said straps and said seat mounting means with a material of sufficient thickness to conceal surface imperfections thereof.
forming a plurality of straps from steel;
securing pairs of said straps to the seat mounting means in parallel relation to one another to form said legs; and coating at least a portion of said straps and said seat mounting means with a material of sufficient thickness to conceal surface imperfections thereof.
2. A method of making a chair base according to claim 1, wherein said straps are formed by stamping sheet stock.
3. A method of making a chair base according to claim 2, wherein said pairs of straps are secured to said seat mounting means by welding and said coating material covers the welds.
4. A method of making a chair base according to claim 3, and further comprising the step of securing caster mounting means to an outer portion of each of said legs prior to the coating step.
5. A method of making a chair base according to claim 4, wherein said seat mounting means comprises a hub formed of tubular steel and said legs are secured to said hub to extend radially therefrom.
6. A method of making a chair base according to claim 5, and further comprising the step of mounting a discrete cover to said seat mounting means.
7. A method of making a chair base according to claim 1, wherein said pairs of straps are secured to said seat mounting means by welding and said material covers the welds.
8. A method of making a chair base according to claim 7, and further comprising the step of securing caster mounting means to an outer portion of said legs prior to the coating step.
9. A method of making a chair base according to claim 1, and further comprising the step of securing caster mounting means to an outer portion of each of said legs prior to the coating step.
10. A method of making a chair base according to claim 1, wherein said seat mounting means comprises a hub formed of tubular steel and said legs are secured to said hub to extend radially therefrom.
11. A method of making a chair base according to claim 10, and further comprising the step of mounting a discrete cover to said seat mounting means.
12. A chair base having seat mounting means; a plurality of legs fixed to said seat mounting means, each leg formed by a pair of straps spaced apart in parallel configuration, each strap formed of a steel stamping and welded at one end thereof to said seat mounting means; and means for mounting a caster at an outer end of each of said legs, said seat mounting means, said legs and said caster mounting means having a coating thereon of sufficient thickness to conceal the welds and surface imperfections thereof.
13. A chair base according to claim 12, wherein said seat mounting means comprises a hub formed of tubular steel.
14. A chair base according to claim 13, wherein said legs are secured to said hub to extend radially therefrom.
15. A chair base according to claim 14, wherein said straps are formed substantially in the shape of a one quarter sine wave.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US20530888A | 1988-06-10 | 1988-06-10 | |
| US205,308 | 1988-06-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1303475C true CA1303475C (en) | 1992-06-16 |
Family
ID=22761670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000602319A Expired - Lifetime CA1303475C (en) | 1988-06-10 | 1989-06-09 | Chair base |
Country Status (5)
| Country | Link |
|---|---|
| US (2) | US5249768A (en) |
| EP (1) | EP0345758B1 (en) |
| JP (1) | JPH0618530B2 (en) |
| CA (1) | CA1303475C (en) |
| DE (2) | DE345758T1 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5454536A (en) * | 1994-01-13 | 1995-10-03 | Westinghouse Electric Corporation | Chair base assembly |
| US5439269A (en) * | 1994-04-22 | 1995-08-08 | Cheng; W. H. | Chair assembly |
| US5527010A (en) * | 1994-09-29 | 1996-06-18 | Boto (Licenses) Limited | Stand for supporting an elongate object |
| US5791611A (en) * | 1996-08-09 | 1998-08-11 | Steelcase Inc. | Hub for chair base |
| US6367749B2 (en) * | 2001-03-21 | 2002-04-09 | Southern Imperial, Inc. | Stand base |
| US6626404B2 (en) | 2001-07-13 | 2003-09-30 | Haworth, Inc. | Chair base |
| US7886674B2 (en) * | 2005-12-05 | 2011-02-15 | L&P Property Management Company | Interlocking, interchangeable support base system |
| US20070252052A1 (en) * | 2006-04-27 | 2007-11-01 | Hou Shun Z | Structural improvement for chair leg |
| US8573547B2 (en) | 2011-04-15 | 2013-11-05 | Whalen Furniture Manufacturing, Inc. | Ready to assemble chair base |
| US11612247B1 (en) | 2020-11-10 | 2023-03-28 | Christopher J. Rusch | Shop chair |
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|---|---|---|---|---|
| US461238A (en) * | 1891-10-13 | Robert m | ||
| US128782A (en) * | 1872-07-09 | Improvement in legs for tables and stands | ||
| US1859223A (en) * | 1930-12-26 | 1932-05-17 | American Model Form Co Inc | Supporting stand |
| US1933372A (en) * | 1932-11-23 | 1933-10-31 | W & J Sloane | Upholstered article |
| US1930021A (en) * | 1932-11-30 | 1933-10-10 | Gen Fireproofing Co | Chair |
| US2086640A (en) * | 1934-08-29 | 1937-07-13 | Arthur T Reynolds | Upholstered article |
| US2044021A (en) * | 1935-03-09 | 1936-06-16 | Theo A Kochs Company | Chair base |
| US2172019A (en) * | 1938-05-05 | 1939-09-05 | Gen Fireproofing Co | Chair base |
| US2233986A (en) * | 1938-06-28 | 1941-03-04 | Mueller Furniture Company | Chair |
| US2350399A (en) * | 1941-07-31 | 1944-06-06 | Posture Res Corp | Chair base |
| US2311875A (en) * | 1942-08-03 | 1943-02-23 | New Indiana Chair Company | Swivel chair action |
| US2470397A (en) * | 1948-03-19 | 1949-05-17 | Harter Corp | Swivel chair base |
| US2587128A (en) * | 1948-10-12 | 1952-02-26 | Eull Fred | Removable seat cover |
| US2979122A (en) * | 1956-06-29 | 1961-04-11 | Knoll Associates | Chair frame and supporting structure |
| US2913208A (en) * | 1958-04-02 | 1959-11-17 | Gen Fireproofing Co | Chair base |
| US3151830A (en) * | 1963-05-15 | 1964-10-06 | Thonet Ind Inc | Chair base |
| US3186669A (en) * | 1963-06-19 | 1965-06-01 | All Steel Equipment Inc | Chair base construction |
| US3174797A (en) * | 1963-09-30 | 1965-03-23 | Massey Ferguson Ltd | Replaceable upholstery for furniture |
| US3273178A (en) * | 1964-06-22 | 1966-09-20 | Bostrom Corp | Method and means for securing seat covers to the base structure of a seat |
| US3281105A (en) * | 1965-08-18 | 1966-10-25 | Corry Jamestown Corp | Chair base |
| GB1209755A (en) * | 1966-11-02 | 1970-10-21 | Fuji Photo Film Co Ltd | Photographic supersensitised silver halide emulsion |
| US3391887A (en) * | 1966-11-14 | 1968-07-09 | Doerner Products Co Ltd | Chair base |
| US3531147A (en) * | 1967-02-14 | 1970-09-29 | Art Metal Inc | Concealed weld construction |
| GB1209765A (en) * | 1967-07-20 | 1970-10-21 | Parnall & Sons Ltd | Improvements relating to chairs |
| US3567278A (en) * | 1969-04-21 | 1971-03-02 | American Seating Co | Upholstered bucket seat |
| US3617023A (en) * | 1970-04-13 | 1971-11-02 | Litton Business Systems Inc | Support |
| US3669499A (en) * | 1970-12-30 | 1972-06-13 | Steelcase Inc | Chair |
| US3682425A (en) * | 1971-01-11 | 1972-08-08 | Art Metal U S Corp | Welded base for chair or the like |
| US3863876A (en) * | 1973-02-01 | 1975-02-04 | Cantreco Ltd | Upright support |
| US3908946A (en) * | 1973-09-10 | 1975-09-30 | Lawrence Simone P | Chair base construction |
| JPS5555651Y2 (en) * | 1975-02-03 | 1980-12-23 | ||
| US4005841A (en) * | 1975-12-31 | 1977-02-01 | Steelcase, Inc. | Chair base arm end cap |
| US4084776A (en) * | 1976-01-21 | 1978-04-18 | Cook Specialty Company | Furniture base and method of making the same |
| DE2609117B2 (en) * | 1976-03-05 | 1978-11-23 | Philips Patentverwaltung Gmbh, 2000 Hamburg | Adjustment device for a device part of a medical treatment or examination device |
| BR7805141A (en) * | 1978-08-09 | 1980-02-20 | Forma Sa Moveis Objetos De Art | STRUCTURAL SYSTEM FOR SEAT UNITS |
| DE2925520A1 (en) * | 1979-06-25 | 1981-01-15 | Mauser Waldeck Gmbh | Swivel chair with adjustable tilt and height - has support column, arm, and sprung telescoping pistons |
| DE8133573U1 (en) * | 1981-11-17 | 1983-05-05 | Fritz Bauer + Söhne oHG, 8503 Altdorf | LOCKABLE LOCKING DEVICE FOR SEAT PARTS OF SEAT FURNITURE |
| US4789122A (en) * | 1987-07-29 | 1988-12-06 | Ditto Sales, Inc. | Table base construction |
-
1989
- 1989-05-02 JP JP1113610A patent/JPH0618530B2/en not_active Expired - Lifetime
- 1989-06-07 DE DE198989110298T patent/DE345758T1/en active Pending
- 1989-06-07 DE DE68911596T patent/DE68911596T2/en not_active Expired - Fee Related
- 1989-06-07 EP EP89110298A patent/EP0345758B1/en not_active Expired - Lifetime
- 1989-06-09 CA CA000602319A patent/CA1303475C/en not_active Expired - Lifetime
- 1989-08-11 US US07/392,721 patent/US5249768A/en not_active Expired - Fee Related
-
1993
- 1993-07-26 US US08/097,158 patent/US5288045A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP0345758A1 (en) | 1989-12-13 |
| JPH0618530B2 (en) | 1994-03-16 |
| EP0345758B1 (en) | 1993-12-22 |
| DE68911596D1 (en) | 1994-02-03 |
| JPH01320009A (en) | 1989-12-26 |
| DE345758T1 (en) | 1990-06-13 |
| DE68911596T2 (en) | 1994-06-16 |
| US5249768A (en) | 1993-10-05 |
| US5288045A (en) | 1994-02-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |